Information recording disc and information signal recording apparatus therefor

ABSTRACT

An information recording disc has a control signal such as an address signal pre-recorded on a guide track which is pre-formed on the information recording disc at a position different from a track position where an information signal is to be recorded. An information signal recording apparatus for recording the information signal on such an information recording dics controls a rotation frequency of the information recording disc to a constant rotation frequency by locking a horizontal synchronizing signal within a composite video signal to edges of pulses reproduced from the guide track, and the information signal is recorded on the information recording disc so that a recording interval of the control signal is positioned within a vertical blanking period of the information signal at least including the composite video signal.

This is a divisional of copending application Ser. No. 917,188 filed onOct. 9, 1986 now U.S. Pat. No. 4,802,159.

BACKGROUND OF THE INVENTION

The present invention generally relates to information recording discsand information signal recording apparatuses for recording informationsignals on the information recording discs, and more particularly to aninformation recording disc having pre-formed thereon a guide track foruse when recording and reproducing an information signal on and from aninformation signal recording track which is formed at a predeterminedposition on the information recording disc, and an information signalrecording apparatus for recording an information signal on such aninformation recording disc.

There is a conventional information recording disc (hereinafter simplyreferred to as a disc) having a guide groove pre-formed thereon beforean information signal is recorded thereon, and such a disc ispre-recorded with an address signal on the guide groove. It is possibleto easily detect a track position on the disc by reproducing the addresssignal.

However, the conventional disc is designed to record on the guide groovethereof also an information signal in addition to the address signal.For this reason, a main beam which scans the guide groove on the disc toreproduce the information signal during a reproducing mode also picks upthe address signal. Even when the address signal is recorded within ablanking period of the information signal, there is a problem in that anaudio signal within a reproduced information signal is modulated by theaddress signal and a noise component is accordingly mixed into areproduced audio signal.

SUMMARY OF THE INVENTION

Accordingly, it is a general object of the present invention to providea novel and useful information recording disc and an information signalrecording apparatus therefor in which the problems described heretoforeare eliminated.

Another and more specific object of the present invention is to providean information recording disc having a control signal such as an addresssignal pre-recorded on a guide track which is pre-formed on theinformation recording disc independently of an information signalrecording track, and an information signal recording apparatus forrecording an information signal on such an information recording disc.According to the information recording disc and the information signalrecording apparatus of the present invention, it is possible toaccurately control the track position, set the disc sensitivity or thelaser power depending on a radial position on the disc and the like forevery one revolution period (for example, one frame) of the disc,because the control signal is pre-recorded on the disc. In addition, inthe case where an address signal is pre-recorded on the disc as thecontrol signal, it is possible to discontinue the recording of theinformation signal at an intermediate position on a recording surface ofthe disc and then continue the recording of a new information signalafter a predetermined time has elapsed from the discontinuance, and alsoleave unrecorded (blank) track turns of the information signal recordingtrack on the disc when recording the information signal during a firstrecording operation and record a different information signal on theunrecorded track turns of the information signal recording track duringa second recording operation. In other words, it is possible to recordinformation on the disc in a variety of methods and accordingly widenthe application range of the disc.

Still another object of the present invention is to provide aninformation recording disc which comprises a spiral guide track orconcentric guide tracks pre-formed thereon at a position different froma track position where an information signal is to be recorded, and acontrol signal is pre-recorded on the guide track. The control signalhas a recording frequency band different from that of the informationsignal which is to be recorded, or the control signal is recorded in arecording interval having a different time position from a recordinginterval of the information signal which is to be recorded. According tothe information recording disc of the present invention, it is possibleto constantly detect the track position and the like during a recordingmode in which the information signal is recorded, since the controlsignal is pre-recorded on the guide track in such a frequency band orrecording interval that each information in the information signal whichis to be recorded is unaffected by the control signal.

A further object of the present invention is to provide an informationsignal recording apparatus for recording an information signal on theinformation recording disc described above, in which a rotationfrequency of the information recording disc is controlled to a constantrotation frequency by locking a horizontal synchronizing signal within acomposite video signal to edges of pulses reproduced from the guidetrack, and the information signal is recorded on the informationrecording disc so that the recording interval of the control signal ispositioned within a vertical blanking period of the information signalat least including the composite video signal. According to theinformation signal recording apparatus of the present invention, it ispossible to discriminate only the control signal from signals reproducedfrom the information recording disc because the recording interval ofthe control signal is positioned within the vertical blanking periodeven when a recording frequency band of the control signal and arecording frequency band of a color burst signal or a frequencyconverted carrier chrominance signal within the information signaloverlap each other.

Other objects and further features of the present invention will beapparent from the following detailed description when read inconjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows an example of a track pattern formed on a disc to which thepresent invention may be applied;

FIG. 2 shows another example of a track pattern formed a disc to whichthe present invention may be applied;

FIG. 3 is a plan view on an enlarged scale showing an essential part ofthe discs shown in FIGS. 1 and 2;

FIG. 4 is a cross sectional view showing an essential part of the discsshown in FIGS. 1 and 2;

FIG. 5 shows an essential part of a track pattern formed on theinformation recording disc according to the present invention;

FIG. 6 shows an embodiment of a signal format of an address signal whichis pre-recorded on the information recording disc;

FIG. 7 shows an example of a signal waveform of the address signal;

FIG. 8 shows frequency spectrums of an information signal which is to berecorded on the information recording disc and the address signalpre-recorded on the information recording disc;

FIGS. 9(A) and 9(B) show signal waveforms for explaining therelationship between a reproduced address signal and a signal which isto be recorded on the information recording disc;

FIG. 10 is a system block diagram showing an embodiment of an essentialpart of the information signal recording apparatus according to thepresent invention;

FIGS. 11(A) through 11(E) show signal waveforms for explaining theoperation of the block system shown in FIG. 10;

FIG. 12 is a circuit diagram showing an embodiment of a frame separatingcircuit within the block system shown in FIG. 10;

FIGS. 13(A) through 13(F) show signal waveforms for explaining theoperation of the circuit shown in FIG. 12;

FIG. 14 is a circuit diagram showing an embodiment of a disc frameseparating circuit within the block system shown in FIG. 10; and

FIGS. 15(A) through 15(E) show signal waveforms for explaining theoperation of the circuit shown in FIG. 14.

DETAILED DESCRIPTION

First, description will be given with respect to an embodiment of theinformation recording disc according to the present invention. Thepresent embodiment will be described for the case where the presentinvention is applied to a disc previously proposed in a U.S. patentapplication Ser. No. 873,407 filed June 12, 1986 now U.S. Pat. No.4,803,677 in which the assignee is the same as the assignee of thepresent application. Hence, description will be given on the previouslyproposed disc by referring to FIGS. 1 through 4.

FIG. 1 shows an information recording disc 11 having a diameter of 30cm, for example, and a spiral guide track T is formed on a recordingsurface with a constant track pitch (for example, 1.6 microns) when thedisc 11 is produced. The guide track T is made up of a plurality ofconsecutive guide track turns, and each guide track turn is constitutedby an intermittent row of pits. In other words, a pre-formed pit 12 anda non-pit portion 13 are alternately formed repeatedly in each guidetrack turn. The pre-formed pits 12 are initially formed on the disc 11before an information signal is first recorded thereon. That is, thepre-formed pits 12 are pre-formed on the disc 11 before the actualrecording of the information signal. In the present specification, thesepre-formed pits 12 will simply be referred to as pits 12.

The length of each pit 12 of the guide track T is selected to a valuewhich is equal to a recording length of one horizontal scanning period(lH) of a video signal recorded on a constant angular velocity (CAV)system disc, for example. In addition, when a recording surface of thedisc 11 is divided into a plurality of imaginary equiangular sectoralregions, the pit 12 is formed in only one of two consecutive guide trackturns of the guide track T in each equiangular sectoral region so thatthe pits 12 are formed in every other guide track turns in a radialdirection of the disc 11 in each equiangular sectoral region. Concretelyspeaking, the pits 12 will naturally be formed in this manner when therecording surface of the disc 11 is divided into an odd number ofequiangular sectoral regions and the pits 12 are formed in every otherequiangular sectoral regions in each guide track turn. For example, whenthe recording surface of the disc 11 is divided into 525 equiangularsectoral regions, one of two consecutive guide track turns comprises 262pits 12 while the other of the two consecutive guide track turnscomprises 263 pits 12.

A center hole 14 is formed at a center of the disc 11, and a labelportion 15 is formed on the periphery of the center hole 14. As will bedescribed later on in the present specification, an information signalincluding the video signal is recorded on and reproduced from aninformation signal recording track formed in a region between twoconsecutive guide track turns of the guide track T, by use of a mainlight beam. In FIG. 1, a center line of the information signal recordingtrack is indicated by a two-dot chain line 16.

FIG. 2 shows another track pattern formed on the previously proposeddisc. In FIG. 2, those parts which are the same as those correspondingparts in FIG. 1 are designated by the same reference numerals, anddescription thereof will be omitted. In FIG. 2, a plurality ofconcentric guide tracks are formed on a disc 20. In the presentspecification, these concentric guide tracks will also be referred to asa plurality of consecutive guide track turns making up the guide track.Pits 21 are intermittently formed on each of the concentric guidetracks. When a recording surface of the disc 20 is divided into aplurality of equiangular sectoral regions, the pit 21 is formed in onlyone of two mutually adjacent concentric guide tracks in each equiangularsectoral region so that the pits 21 are formed in every other concentricguide tracks in a radial direction of the disc 20 in each equiangularsectoral region. Concretely speaking, the pits 21 will naturally beformed in this manner when the recording surface of the disc 20 isdivided into an even number of equiangular sectoral regions and the pits21 are formed in every other equiangular sectoral regions in eachconcentric guide track, that is, in each guide track turn.

The information signal is recorded on and reproduced from an informationsignal recording track formed in a region between two mutually adjacentconcentric guide tracks, by use of the main light beam. In FIG. 2, acenter line of the information signal recording track is indicated by atwo-dot chain line 22. According to the disc 20, a plurality ofconcentric information signal recording tracks are formed because theguide track is made up of the plurality of concentric tracks. In thepresent specification, these concentric information signal recordingtracks will also be referred to as a plurality of consecutiveinformation recording track turns making up the information signalrecording track.

The discs 11 and 20 only differ in that the guide track of the disc 11is made up of a spiral guide track and the guide track of the disc 20 ismade up of a plurality of concentric guide tracks, and the configurationand recording arrangement of the pits 12 and 21 are the same. In otherwords, as shown on an enlarged scale in FIG. 3 which shows a part of thetrack pattern of the disc 11 (20), the start and end of each pit 12 (21)indicated by hatchings in one equiangular sectoral region respectivelycoincide with the end of the pit 12 (21) in one adjacent equiangularsectoral region and the start of the pit 12 (21) in another adjacentequiangular sectoral region. Boundary lines 25 indicated by one-dotchain lines connect the starts and ends of the pits 12 (21) in theradial direction of the disc 11 (20), and these boundary lines 25 definethe equiangular sectoral regions.

FIG. 4 shows the cross sectional configuration of the disc 11 (20). Asshown in FIG. 4, a depth of the pit 12 (21) is selected to 1/4 thewavelength λ of the main and sub light beams. Hence, a phase error λ/2is introduced between the light reflected within the groove of the pit12 (21) and the light reflected at a position other than the groove, andthe light intensity is greatly attenuated in the case of the lightreflected at the position other than the groove.

According to the previously proposed disc, it is possible to obtain atracking error signal from signals reproduced from the guide track bythe main light beam because the disc comprises a recording surface whichis divided into a plurality of equiangular sectoral regions and a guidetrack formed on the recording surface, where each track turn of theguide track is constituted by a row of intermittent pits formed in everyother equiangular sectoral regions, and the pit is only formed in one oftwo mutually adjacent track turns of the guide track in each equiangularsectoral region so that the pits are formed in every other track turnsin a radial direction of the disc in each equiangular sectoral region.Hence, although the conventional disc having two continuous spiral guidetracks (grooves) located on both sides of an information signalrecording track suffers a problem in that a trailing sub light beam isaffected by the pits of the information signal recorded by a main lightbeam, it is possible to eliminate such a problem according to thepreviously proposed disc. Furthermore, it is possible to preventdiffraction in a reflected light beam from the guide track since theguide track has a depth of 1/4 the wavelength of the main light beamsfor recording and reproducing the information signal. For this reason,the tracking error signal will not be affected by diffracted light evenwhen the main light beam traverses the guide track. As a result, theastigmatic focusing method can be used as a method of detecting a focalerror, and the construction of an optical system in a recording andreproducing apparatus can be simplified compared to that of theconventional recording and reproducing apparatus which is designed toplay the conventional disc having a single continuous spiral guide trackwhich is recorded with the information signal.

Next, description will be given with respect to the embodiment of theinformation recording disc according to the present invention. In FIG.5, a two-dot chain line I indicates a center line of an informationsignal recording track formed on a CAV system disc which is to berotated at a constant angular velocity, and corresponds to the two-dotchain lines 16 and 22 shown in FIGS. 1 and 2, respectively. Pre-formedpits 30 of a track turn of the guide track are formed for every other lHon the lower side of the two-dot chain line I (that is, inner peripheralside of the disc), and pre-formed pits 31 of a track turn of the guidetrack are formed for every other lH on the upper side of the two-dotchain line I (that is, outer peripheral side of the disc). As in thecase of the previously proposed disc described before, the disccomprises a recording surface which is divided into a plurality ofequiangular sectoral regions and a guide track formed on the recordingsurface, where each track turn of the guide track is constituted by arow of intermittent pits 30 (or 31) formed in every other equiangularsectoral regions, and the pit 30 (or 31) is only formed in one of twomutually adjacent track turns of the guide track in each equiangularsectoral region so that the pits 30 (or 31) are formed in every othertrack turns in a radial direction of the disc in each equiangularsectoral region.

In FIG. 5, portions 32 through 35 indicated with an "X" mark indicaterecording portions where an address signal is pre-recorded as an exampleof a control signal. In the track turn of the guide track on the innerperipheral side of the disc, the recording portions 32 and 33 arerespectively arranged between two pits 30. Similarly, in the track turnof the guide track on the outer peripheral side of the disc, therecording portions 34 and 35 are respectively arranged between two pits31. In other words, address signals containing identical addressinformation are pre-recorded at two positions in each track turn of theguide track when the disc is produced, so as to enable an address errorchecking. The address signals recorded in the recording portions 32through 35 are respectively constituted by digital data having a signalformat shown in FIG. 6. The address signal is modulated according to apredetermined modulation system such as the phase encoding (hereinaftersimply referred to as PE) before being recorded on the disc.

In FIG. 6, one address signal is constituted by seven words X₆ throughX₀, and the words X₆ through X₀ are recorded and reproduced in thesequence of the words X₆ →X₅ → . . . →X₁ →X₀. One word comprises fourbits, and the address signal as a whole therefore comprises twenty-eightbits. The word X₆ comprises start bits indicating a value "F" inhexadecimal (that is, a value "1111" in decimal), for example, and theword X₅ comprises disc information bits. The words X₄ through X₀comprise track address bits containing the track address. The trackaddress bits indicate the number of track turns from an innermostperipheral position on the disc when it is assumed that one track turnis counted for each revolution of the disc. The words X₄, X₃, X₂, X₁ andX₀ indicate the values in the ten thousands digit, thousands digit,hundreds digit, tens digit and ones digit, respectively. Accordingly, amaximum of 99,999 track turns may be described by the words X₄ throughX₀.

FIG. 7 shows an example of the signal waveform of one address signal.Upper four bits including a most significant bit (MSB) corresponds tothe word X₆, and in FIG. 7, the values of data are shown below thesignal waveform. In FIG. 5, the address signals are reproduced from therecording portions 32 through 35 in the sequence of the recordingportions 34→32→35→33. The address signals reproduced from the recordingportions 34 and 35 are discriminated as address signals reproduced froman odd numbered track turn of the guide track and the address signalsreproduced from the recording portions 32 and 33 are discriminated asaddress signals reproduced from an even numbered track turn of the guidetrack, because the values of the address signals are preset so that itis possible to discriminate the address signals reproduced from the oddand even numbered track turns of the guide track.

For example, an information signal comprising a color video signal andtwo channels of audio signals are recorded on and reproduced from trackturns of the information signal recording track. The color video signalis separated into a luminance signal and a carrier chrominance signal,and the separated luminance signal is frequency-modulated into afrequency modulated (FM) luminance signal having a carrier deviationband of 5.6 MHz to 7.0 MHz, for example, as indicated by a solid line IIin FIG. 8. The separated carrier chrominance signal isfrequency-converted into a frequency band lower than the frequency bandof the FM luminance signal and is converted into a frequency convertedcarrier chrominance signal having a carrier frequency of approximately743 kHz as indicated by a solid line III. The two channels of audiosignals are independently frequency-modulated into FM audio signalshaving carrier frequencies of 1.5 MHz and 1.8 MHz, respectively, asindicated by solid lines IV and V. The FM luminance signal, thefrequency converted carrier chrominance signal and the FM audio signalsare frequency-division-multiplexed into a frequency division multiplexedsignal, and the frequency division multiplexed signal is recorded on thetrack turns of the information signal recording track.

On the other hand, the address signal is modulated according to the PE,for example, before being recorded on the disc. For example, a maximumfrequency of the modulated address signal is approximately 818 kHz whichis fifty-two times the horizontal scanning frequency, and a minimumfrequency of the modulated address signal is approximately 409 kHz whichis twenty-six times the horizontal scanning frequency. In other words,the modulated address signal has a frequency spectrum indicated by aphantom line VI in FIG. 8. In order to minimize the undesirable effectsof the modulated address signal on the FM audio signals, the maximum andminimum frequencies of the modulated address signal are selected so thata valley portion of the frequency spectrum VI is located at the carrierfrequencies of the FM audio signals.

As a result, the frequency spectrum VI of the modulated address signaloverlaps the frequency band III of the frequency converted carrierchrominance signal as shown in FIG. 8, and the frequency convertedcarrier chrominance signal and the modulated address signal cannot berecorded simultaneously. For this reason, it is necessary to record thefrequency converted carrier chrominance signal and the modulated signalat mutually different positions on the time base. As is well known, thefrequency converted carrier chrominance signal including the color burstsignal is not transmitted during the horizontal blanking periodexcluding the back porch nor during a specific time period within thevertical blanking period. Hence, in the disc according to the presentinvention, the recording portions 32 through 35 are pre-formed at thetime of the production of the disc so that each recording portion islocated at a specific position within the vertical blanking periodavoiding the time period of the color burst signal.

When recording on the disc the frequency division multiplexed signal ofthe FM luminance signal, the frequency converted carrier chrominancesignal and the FM audio signals, a jitter occurs due to the eccentricityand the like of the disc. As will be described later on in the presentspecification, the rotation of the disc is controlled during therecording and reproduction of the information signal (frequency divisionmultiplexed signal) so that edges of pulses reproduced from the pits 30and 31 become locked to the horizontal synchronizing signal within theinformation signal. In this case, the phase of the color burst signalwith respect to the address signal becomes relatively advanced orretarded due to the jitter. For this reason, the recording interval andthe recording position of the address signal (modulated address signal)are selected so that the color burst signal CB within the verticalblanking period shown in FIG. 9(B) becomes positioned approximately atthe center portion of a time interval t1+t2 between mutually adjacentaddress signals adrl and adr2 within the reproduced pulses rep shown inFIG. 9(A) reproduced from the pits of the guide track on the disc. Inother words, the recording interval of the address signal is selected sothat the color burst signal CB is positioned approximately at the centerportion of the time interval t1+t2 in which the address signal is notreproduced, that is, the time interval t1+t2 from the terminal positionof the recording interval of the address signal adrl reproduced from onetrack turn of the guide track to the starting position of the recordinginterval of the address signal adr2 reproduced from the other track turnof the guide track out of the two track turns of the guide track on bothsides of one track turn of the information signal recording track. As aresult, the time interval t1+t2 is selected to 29.4 microseconds, andthe address signal is pre-recorded on the guide track together with thepits for a time interval of approximately 34.2 microseconds from aposition which is approximately 19.6 microseconds from the terminal endof one pit.

According to the disc of the present invention, it is possible toaccurately control the track position, set the disc sensitivity or thelaser power depending on a radial position on the disc and the like forevery one revolution period (for example, one frame) of the disc,because the control signal is pre-recorded on the disc. In addition, inthe case where the address signal is pre-recorded on the disc as thecontrol signal, it is possible to discontinue the recording of theinformation signal at an intermediate position on the recording surfaceof the disc and then continue the recording of a new information signalafter a predetermined time has elapsed from the discontinuance, and alsoleave unrecorded (blank) track turns of the information signal recordingtrack on the disc when recording the information signal during a firstrecording operation and record a different information signal on theunrecorded track turns of the information signal recording track duringa second recording operation. In other words, it is possible to recordinformation on the disc in a variety of methods and accordingly widenthe application range of the disc.

Next, description will be given with respect to an embodiment of theinformation signal recording apparatus according to the presentinvention. FIG. 10 shows the embodiment of the information signalrecording apparatus and a composite video signal which is to be recordedis applied to an input terminal 40. The signal waveform of the compositevideo signal in a vicinity of the vertical blanking period is indicatedby a in FIG. 11(A). A synchronizing signal separating circuit 41separates a composite synchronizing signal b shown in FIG. 11(B) fromthe composite video signal a. A frame separating circuit 42discriminates whether the composite synchronizing signal b relates to afirst (odd) field or a second (even) field, and produces a frame pulsesignal c shown in FIG. 11(C) which rises within a vertical synchronizingpulse of the predetermined one of the first and second fields and fallswithin a vertical. synchronizing pulse of the other one of the first andsecond fields.

FIG. 12 shows an embodiment of the frame separating circuit 42. Acomposite synchronizing signal shown in FIG. 13(A) which is identical tothe composite synchronizing signal b shown in FIG. 11(B) is applied to aterminal 60 and is supplied to a monostable multivibrator 61 and to alowpass filter 62. The lowpass filter 62 comprises resistors Rl and R2and capacitors Cl and C2 which are connected as shown. An output signalof the monostable multivibrator 61 shown in FIG. 13(B) is supplied to amonostable multivibrator 63 and is formed into a signal shown in FIG.13(C). The output signal of the monostable multivibrator 63 is suppliedto a data input terminal D of a latch circuit 64. An output signal ofthe lowpass filter 62 indicated by a solid line in FIG. 13(D) iscompared with a reference level El indicated by a phantom line in acomparator 65. As a result, a signal shown in FIG. 13(E) is obtainedfrom the comparator 65 and is supplied to a clock input terminal CLK ofthe latch circuit 64. Accordingly, a frame pulse signal shown in FIG.13(F) which is identical to the frame pulse signal c shown in FIG. 11(C)is outputted from the latch circuit 64 and is supplied to a delaycircuit 43 shown in FIG. 10 via a terminal 66.

The frame pulse signal c having a period of one frame is converted intoa pulse signal d shown in FIG. 11(D) in the delay circuit 43 which isconstituted by a monostable multivibrator, for example. The pulse signald has a rising edge within the horizontal scanning period of thescanning line number "16", for example. This pulse signal d is suppliedto a phase comparator 44.

On the other hand, recording portions on a disc 46 such as the recordingportions 32 through 35 shown in FIG. 5 are scanned by a sub light beamof a known recording and reproducing means 47, for example, andreproduced control signals are supplied to a disc frame separatingcircuit 48. The information signal including the composite video signalis recorded by a main light beam at a rate of two fields per onerevolution of the disc 46 at the position indicated by the two-dot chainline I (two-dot chain lines 16 and 22 shown in FIGS. 1 and 2) betweenthe two mutually adjacent track turns on the guide track.

The composite video signal a from the input terminal 40 is supplied to ahighpass filter 50 and to a lowpass filter 53. The highpass filter 50separates a luminance signal within the composite video signal a, and afrequency modulator 51 frequency-modulates the separated luminancesignal into a frequency modulated (FM) luminance signal. The FMluminance signal is supplied to a frequency division multiplexingcircuit 52. On the other hand, the lowpass filter 53 separates a carrierchrominance signal within the composite video signal a, and a frequencyconverter 54 frequency-converts the separated carrier chrominance signalinto a frequency band lower than a frequency band of the FM luminancesignal. An output frequency converted carrier chrominance signal of thefrequency converter 54 is supplied to the frequency divisionmultiplexing circuit 52. Two channels of audio signals are applied toinput terminals 55a and 55b, for example, and the audio signals areindependently frequency-modulated into FM audio signals in a frequencymodulator 56. The FM audio signals are supplied to the frequencydivision multiplexing circuit 52. The signals which have the frequencyspectrums II through V shown in FIG. 8 and are supplied to the frequencydivision multiplexing circuit 52 are frequency-division-multiplexed intoa frequency division multiplexed signal. The frequency divisionmultiplexed signal is supplied to the recording and reproducing means 47and is recorded on the disc 46 by a recording means of the recording andreproducing means 47 while reproducing the control signal (addresssignal) from the guide track on the disc 46 by a reproducing means ofthe recording and reproducing means 47.

The disc frame separating circuit 48 generates a pulse signal e shown inFIG. 11(E) which rises in synchronism with the edge of the addresssignal which is reproduced from the recording portion 34, that is, insynchronism with the edge of the address signal which is reproducedfirst out of the address signals recorded in the recording portions 32through 35.

FIG. 14 shows an embodiment of the disc frame separating circuit 48. Areproduced address signal shown in FIG. 15(A) is applied to a terminal70 and is formed into a signal shown in FIG. 15(B) in a bandpass filter71. The output signal of the bandpass filter 71 is formed into a signalindicated by a solid line in FIG. 15(C) in a full wave rectifyingcircuit 72, and the output signal of the full wave rectifying circuit 72is compared with a reference level E2 indicated by a phantom line inFIG. 15(C) in a comparator 73. A signal shown in FIG. 15(D) is obtainedfrom the comparator 73 and is supplied to a retriggerable monostablemultivibrator 74. As a result, a pulse signal shown in FIG. 15(E) whichis identical to the pulse signal e shown in FIG. 11(E) is obtained fromthe retriggerable monostable multivibrator 74 and is supplied to thephase comparator 44 shown in FIG. 10 via a terminal 75.

The phase of the pulse signal e is compared with the phase of the pulsesignal d described before in the phase comparator 44. An output errorvoltage of the phase comparator 44 dependent on the phase error betweenthe pulse signals d and e is supplied to a motor 45 via a predetermineddriving circuit (not shown) so as to control the rotation of the motor45.

The motor 45 rotates a turntable (not shown) on which the disc 46 isplaced. Under a steady-state rotation, the motor 45 rotates at a speedof 1800 rpm in phase synchronism with the edges of the pits 30 and 31.The rotational phase of the motor 45 is controlled responsive to thephase error voltage of the phase comparator 44. Hence, the compositevideo signal is recorded on the disc 46 so that the horizontal scanningperiod of the scanning line number "16" within the vertical blankingperiod becomes positioned within the recording portion 34 in which theaddress signal is pre-recorded, as shown in FIG. 5. The numerals shownin brackets in FIG. 5 and the numerals shown above the signal waveformin FIG. 11(A) indicate the scanning line number of the composite videosignal.

According to the information signal recording apparatus of the presentinvention, it is possible to discriminate only the control signal fromthe signals reproduced from the information recording disc because therecording interval of the control signal is positioned within thevertical blanking period even when a recording frequency band of thecontrol signal and a recording frequency band of a color burst signal ora frequency converted carrier chrominance signal within the informationsignal overlap each other. In addition, it is possible to prevent thecontrol signal from mixing into the reproduced picture as noise and alsoprevent the audio signals from mixing into the reproduced picture asnoise, because the guide track is provided independently of theinformation signal recording track.

The present invention is not limited to the embodiments describedheretofore, and the control signal (address signal) may be recordedwithin the pit of the guide track or recorded so as to partly overlapthe pit. A control signal other than the address signal, such as acontrol signal for setting disc sensitivity or the laser power dependingon the radial position on the disc, may be recorded on the disc. Theguide track is not limited to the row of intermittent pits, and may takeany form as long as the guide track is pre-formed on the disc at aposition different from the track position where the information signalis to be recorded. In addition, the modulation system for the controlsignal (address signal) is not limited to the PE, and it is possible toemploy other modulation systems which allow self-clock demodulation.Moreover, the information signal which is recorded on the disc is notlimited to the information signal including the composite video signal.

Further, the present invention is not limited to these embodiments, butvarious variations and modifications may be made without departing fromthe scope of the present invention.

What is claimed is:
 1. An information signal recording apparatus forrecording an information signal including a composite video signal on aninformation recording disc, said information recording disc comprising arecording surface and a guide track formed on said recording surface ata position different from a track position of the information signalwhich is to be recorded, said guide track comprising a spiral guidetrack or concentric guide tracks, said guide track being pre-recordedwith a control signal in recording portions thereof, said informationsignal recording apparatus comprising:a motor for rotating saidinformation recording disc; recording means for recording theinformation signal on said information recording disc while reproducingsaid control signal from said information recording disc; and controlmeans responsive to a synchronizing signal within the information signaland a reproduced control signal reproduced from said guide track of saidinformation recording disc for controlling a rotation of said motor sothat said recording means records the information signal on aninformation signal recording track located in a region between twomutually adjacent track turns of said guide track by positioning each ofsaid recording portions within a vertical blanking period of thecomposite video signal.
 2. An information signal recording apparatus asclaimed in claim 1 in which said control means comprises a separatingcircuit for separating a composite synchronizing signal from thecomposite video signal of the information signal which is to berecorded, a pulse generating circuit responsive to the separatedcomposite synchronizing signal for generating a first pulse signal whichundergoes a transition within one predetermined horizontal scanningperiod, and a phase comparator for comparing a phase of said first pulsesignal and a phase of a signal which is synchronized to edges of thereproduced control signal and for producing a phase error signal whichcontrols said motor.
 3. An information signal recording apparatus asclaimed in claim 2 in which said control means further comprises acircuit for supplying to said phase comparator a second pulse signalwhich undergoes a transition responsive to edges of the reproducedcontrol signal which is reproduced first during one revolution period ofsaid information recording disc.
 4. An information signal recordingapparatus as claimed in claim 2 in which said pulse generating circuitcomprises a circuit for discriminating whether the separated compositesynchronizing signal is of an odd field or an even field and forgenerating a second pulse signal which undergoes a first transition atthe odd field and a second transition at the even field, and a circuitfor delaying said second pulse signal so as to generate said first pulsesignal which undergoes a transition within said one predeterminedhorizontal scanning period.
 5. An information signal recording apparatusas claimed in claim 1 in which said recording means records aninformation signal which has a frequency band different from a frequencyband of said control signal.
 6. An information signal recordingapparatus as claimed in claim 1 in which a first track turn out of saidtwo mutually track turns of said guide track comprises a first recordingportion in which said control signal is pre-recorded and a second trackturn out of said two mutually adjacent tracks turns of said guide trackcomprises a second recording portion in which said control signal ispre-recorded, said first track turn being scanned before in time ascompared to said second track turn, said control means controlling saidmotor so that said recording means records a color burst signal of thecomposite video signal approximately at a center of an interval betweena terminal position of said first recording portion and a startingposition of said second recording portion.